Secondary battery

Abstract

The present invention relates to a secondary battery which has few restrictions in shape, has an improved battery capacity, and may reduce the amount of moisture introduced from outside. The secondary battery, according to the present invention, comprises: an electrode assembly; an exterior film surrounding a portion of the electrode assembly; and a cap surrounding the rest of the electrode assembly. The cap comprises: an exterior part coupled to the exterior film; and a terminal part exposed to both the outer side and the inner side of the exterior part, and electrically connected to the electrode assembly at the portion exposed to the inner side of the exterior part, wherein movement of the terminal part in the direction moving away from the electrode assembly may be restricted by the exterior part.

Description

secondary battery

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2023-0117884, filed September 5, 2023, and Korean Patent Application No. 10-2024-0066011, filed May 21, 2024, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The present invention relates to a secondary battery, and more specifically, to a secondary battery capable of being charged and discharged.

[0005] In recent years, rising energy prices due to the depletion of fossil fuels and growing concerns about environmental pollution have made the demand for eco-friendly alternative energy sources essential for future living. Research is continuing into various power generation technologies, such as solar, wind, and tidal power. Furthermore, significant interest is being focused on power storage devices, such as batteries, to more efficiently utilize the generated electricity.

[0006] Moreover, with the technological development and increasing demand for battery-powered electronic mobile devices and electric vehicles, the demand for batteries as an energy source is rapidly increasing, and accordingly, much research is being conducted on batteries that can meet various needs.

[0007] Batteries that store electrical energy can generally be divided into primary and secondary batteries. Primary batteries are disposable, consumable batteries, whereas secondary batteries are rechargeable batteries manufactured using materials capable of repeatable oxidation and reduction processes between current and a substance. In other words, when current causes a reduction reaction in a material, the battery is charged, and when an oxidation reaction occurs in the material, the battery is discharged. This repeated charge-discharge cycle generates electricity.

[0008] Secondary batteries can be classified into cylindrical cells, pouch cells, and prismatic cells based on their shape. Among them, pouch cells can be manufactured in a form in which an electrode assembly in which a positive electrode, a negative electrode, and a separator are laminated is accommodated inside a pouch, and the outer part of the pouch is sealed.

[0009] Conventional pouch cells suffer from cracks in the pouch film during the forming process, resulting in significant waste after the degassing process. Furthermore, the material properties of the pouch film limit the depth at which it can be formed, limiting any increase in battery capacity.

[0010] Therefore, there is a need for a secondary battery that has relatively few restrictions on shape while allowing for increased battery capacity.

[0011] The object of the present invention is to provide a secondary battery having fewer restrictions on shape, improved battery capacity, and capable of reducing the amount of moisture flowing in from the outside.

[0012] A secondary battery according to the present invention comprises an electrode assembly, an outer film covering a portion of the electrode assembly, and a cap covering the remainder of the electrode assembly, wherein the cap comprises an outer portion coupled to the outer film, and a terminal portion exposed to the outside and inside of the outer portion, respectively, and electrically connected to the electrode assembly at a portion exposed to the inside of the outer portion, wherein movement of the terminal portion away from the electrode assembly can be restricted by the outer portion.

[0013] The terminal portion may include an exposed portion exposed to the outside of the outer portion, and a support portion connected to the exposed portion but supported by the outer portion on the inside of the outer portion to prevent the exposed portion from being separated from the outer portion.

[0014] The above-mentioned exposed portion may include an outer member formed in a shape overlapping by a through hole formed in the outer member for connecting the exposed portion and the support portion and disposed on the outside of the outer member, and a passing member formed along the edge of the outer member, extending inwardly from the edge of the outer member to pass through the through hole.

[0015] The above support member may include a first member that extends from the passing member in a direction perpendicular to the extension direction of the passing member and is arranged to be hung on the inner surface of the outer part.

[0016] The support member may further include a second member extending from the first member toward the electrode assembly, one end of which is electrically connected to the electrode assembly.

[0017] The second member may include a metal material, and the outer film may include a resin layer that is bonded to the second member by heat and pressure.

[0018] The outer portion may include a first cover portion that covers the first member from the outside of the outer portion, and a second cover portion that is disposed between the second member and the outer film, is combined with the outer film, and extends from the first cover portion toward the electrode assembly.

[0019] The support portion includes a metal material, the first cover portion includes a resin material having adhesiveness by heat, and the support portion and the first cover portion can be joined to each other by heat and pressure.

[0020] The terminal portion may be arranged so that one side protrudes away from one side of the outer portion in a direction away from the electrode assembly.

[0021] The above cap may be arranged such that one side of the outer portion and one side of the terminal portion are on the same surface.

[0022] The above outer part may include a metal material, and the outer film may include a metal layer that is welded to the outer part.

[0023] The above outer part may include a resin material having adhesiveness by heat, and the outer film may include a resin layer that is bonded to the outer part by heat and pressure.

[0024] The outer film and the outer part can be joined to each other by an adhesive applied between the outer film and the outer part.

[0025] The outer portion and the terminal portion can be joined to each other by an adhesive applied between the outer portion and the terminal portion.

[0026] A secondary battery according to the present invention comprises an electrode assembly, an internal space for accommodating the electrode assembly, and an external film having an external opening for communicating the internal space with the outside, and

[0027] The outer film includes a cap covering the outer material opening, and the cap includes an outer part coupled to the outer film, and a terminal part exposed to the outside and inside of the outer part, respectively, and electrically connected to the electrode assembly at a part exposed to the inside of the outer part, and the terminal part is arranged to block at least a part of the outer material opening, and may be made of a material having lower moisture permeability than a material constituting the outer part.

[0028] Since the secondary battery according to a preferred embodiment of the present invention does not have a process for forming an outer film, there are fewer restrictions on the shape in which the outer film accommodates the electrode assembly, the possibility of defects such as cracks occurring in the outer film is reduced, and the battery capacity can be improved.

[0029] In addition, the safety of the secondary battery can be improved by reducing the degree to which moisture, etc., penetrates from the outside of the secondary battery into the inside of the secondary battery.

[0030] In addition, the structural stability of the secondary battery can be improved by the bonding relationship and arrangement form of the terminal portion and the external portion.

[0031] The effects according to the present invention are not limited to the contents exemplified above, and more diverse effects are included in this specification.

[0032] FIG. 1 is a perspective view schematically illustrating a secondary battery according to Example 1 of the present invention.

[0033] Figure 2 is an exploded perspective view schematically illustrating a secondary battery according to Example 1 of the present invention.

[0034] FIG. 3 is a cross-sectional view schematically illustrating a portion of a cross-section taken along line A-A' of FIG. 1 of a secondary battery according to Example 1 of the present invention.

[0035] Figure 4 is an exploded perspective view schematically illustrating a secondary battery according to Example 2 of the present invention.

[0036] FIG. 5 is a cross-sectional view schematically illustrating a cap and a portion of an outer film of a secondary battery according to Example 2 of the present invention.

[0037] Hereinafter, with reference to the attached drawings, preferred embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the invention. However, the present invention may be implemented in various different forms and is not limited or restricted by the following examples.

[0038] In order to clearly explain the present invention, a detailed description of a part that is irrelevant to the description or a related known technology that may unnecessarily obscure the gist of the present invention has been omitted, and when adding reference signs to components of each drawing in this specification, the same or similar reference signs are attached to the same or similar components throughout the specification.

[0039] In addition, terms or words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term to explain his or her own invention in the best way.

[0040] Example 1

[0041] FIG. 1 is a perspective view schematically illustrating a secondary battery (10) according to Embodiment 1 of the present invention, and FIG. 2 is an exploded perspective view schematically illustrating a secondary battery (10) according to Embodiment 1 of the present invention.

[0042] A secondary battery (10) according to Example 1 of the present invention may include an electrode assembly (100), an outer film (200), and a cap (300). Below, each component of the secondary battery (10) will be described in more detail. For reference, the contents of Example 1 may be equally applied to the following examples, as long as they do not conflict with each other.

[0043] The electrode assembly (100) of the secondary battery (10) may include a positive electrode, a negative electrode, and a separator. Here, the separator may be placed between the positive electrode and the negative electrode to physically separate the positive electrode and the negative electrode. The electrode assembly (100) may be in the form of a stacked positive electrode, a negative electrode, and a separator, or in the form of a jelly-roll in which the positive electrode, the negative electrode, and the separator are rolled up.

[0044] Meanwhile, the electrode assembly (100) may be provided with an electrode tab (110) connected to the electrode. The electrode tab (110) may be provided separately or as part of a current collector constituting the electrode. For reference, if the electrode assembly (100) is an all-solid-state battery, a solid electrolyte may be provided instead of a separator.

[0045] Referring to FIG. 2, the secondary battery (10) according to Embodiment 1 of the present invention may include an outer film (200). The outer film (200) of the secondary battery (10) may be provided to wrap a portion of the electrode assembly (100). Specifically, the outer film (200) may be provided to wrap a cap (300) to be described later and the electrode assembly (100). More specifically, the outer film (200) may be combined with the cap (300) to form an internal space, and the electrode assembly (100) may be accommodated in the internal space.

[0046] The outer film (200) of the secondary battery (10) may have a shape in which a sheet or film is rolled along the side of the electrode assembly (100). That is, the outer film (200) may be arranged in a shape that wraps around the side of the electrode assembly (100). At this time, one end and the other end of the outer film (200) may be arranged in a shape in which they meet each other and wrap the electrode assembly (100). With respect to the shape in which one end and the other end of the outer film (200) meet each other, a case in which one side of one end and the other side of the other end are joined so as to be in contact with each other (see FIG. 2) are possible, and a case in which one side of one end and one side of the other end are joined so as to be in contact with each other (see FIG. 4) are possible. This is merely an example, and the shape in which one end and the other end of the outer film (200) are joined to form a space that accommodates the electrode assembly (100) may vary.

[0047] With respect to the method of joining one end and the other end of the outer film (200), the one end and the other end of the outer film (200) may be joined to each other by heat sealing or heat and pressure sealing. That is, the outer film (200) may include a material having heat sealing properties. Specifically, the outer film (200) may include a material that melts by heat and has adhesive properties. For example, the outer film (200) may include one or more materials selected from the group consisting of polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, acrylic polymers, polyacrylonitrile, polyimide, polyamide, cellulose, aramid, nylon, polyester, polyparaphenylenebenzobisoxazole, polyarylate, Teflon, and glass fiber. Mainly, a polyolefin resin such as polypropylene (PP) or polyethylene (PE) may be used. In particular, polypropylene (PP) can have excellent mechanical properties such as tensile strength, rigidity, surface hardness, wear resistance, and heat resistance, as well as chemical properties such as corrosion resistance.

[0048] Meanwhile, the outer film (200) may be arranged to wrap a portion of the electrode assembly (100), and the cap (300) may be arranged to wrap the remainder of the electrode assembly (100). Specifically, when the outer film (200) is arranged to wrap the electrode assembly (100) along the side of the electrode assembly (100), outer openings may be formed at both ends of the electrode assembly (100). The cap (300) of the secondary battery (10) is combined with the outer film (200) in a form that covers the outer openings at both ends of the electrode assembly (100), and the electrode assembly (100) may be accommodated in the internal space formed by the outer film (200) and the cap (300).

[0049] As an example of a method of joining the cap (300) and the outer film (200), the cap (300) and the outer film (200) may be joined by welding. Specifically, the outer portion (310) may include a metal material, and the outer film (200) may include a metal layer that can be joined to the outer portion (310) by welding at a portion facing the outer portion (310).

[0050] As another example of a method of combining the cap (300) and the outer film (200), the cap (300) and the outer film (200) may be combined by sealing. Specifically, the outer portion (310) may include a resin material having adhesiveness by heat, and the outer film (200) may include a resin layer that can be combined with the outer portion (310) by heat and pressure at a portion facing the outer portion (310). Here, the resin layer may include a material having sealing properties by heat as described above.

[0051] Conventional pouch cells were formed by forming a cup portion to accommodate an electrode assembly (100) by forming a sheet or film. During the forming process of the cup portion, the depth that can be formed was limited depending on the material properties of the sheet or film, and the capacity that could accommodate the electrode assembly (100) was also limited. In addition, when forming a sheet or film, the thickness at the corners was the thinnest, so defects such as cracks frequently occurred. In addition, conventional pouch cells required a gas collection portion to collect gas in the degassing process to remove gas accumulated inside the pouch, and there were many cases where the gas collection portion was removed and discarded after the degassing process.

[0052] On the other hand, in the secondary battery (10) according to Example 1 of the present invention, since the outer film (200) can be used according to the volume of the electrode assembly (100), there may be no limitation on the capacity that can accommodate the electrode assembly (100). In addition, since molding of the cup portion is not required, the occurrence of defects such as cracks in the outer film (200) can be prevented, and the material and thickness of the outer film (200) can be selected relatively freely. In addition, since the electrolyte injection and degassing processes can be performed through the cap (300), the outer film (200) is not discarded, so the economic feasibility of the process can be improved.

[0053] Meanwhile, although not described in detail in the present invention, the cap (300) may further include an electrolyte injection port for injecting an electrolyte or a gas discharge port for discharging gas in a degassing process.

[0054] FIG. 3 is a cross-sectional view schematically illustrating a portion of a cross-section taken along line A-A' of FIG. 1 of a secondary battery (10) according to Embodiment 1 of the present invention. Referring to FIG. 3, a cap (300) of a secondary battery (10) according to Embodiment 1 of the present invention may include an outer portion (310) and a terminal portion (320).

[0055] The outer portion (310) of the cap (300) may be coupled with the outer film (200). In addition, the terminal portion (320) of the cap (300) may be coupled to the outer portion (310) and may be provided to be exposed to the outer and inner sides of the outer portion (310), respectively. Here, the inner side of the outer portion (310) may refer to a part of the internal space formed by the cap (300) and the outer film (200), and the outer side of the outer portion (310) may refer to a space outside the cap (300) and the outer film (200). Meanwhile, a portion of the terminal portion (320) exposed to the inner side of the outer portion (310) may be electrically connected to the electrode assembly (100). At this time, the electrical connection may include both a direct connection between the terminal portion (320) and the electrode assembly (100) and an indirect connection via another electrically conductive member.

[0056] Meanwhile, as an example of a method for joining the outer portion (310) and the terminal portion (320), joining by sealing is possible. The terminal portion (320) may include a metal material, and the outer portion (310) may include a resin material that has adhesive properties due to heat. Accordingly, the resin material of the outer portion (310) that has adhesive properties due to heat melts, and can be joined to the terminal portion (320) by pressure.

[0057] As an example of a configuration for improving the structural stability of the cap (300), the terminal portion (320) of the cap (300) according to Embodiment 1 of the present invention may have its movement away from the electrode assembly (100) restricted by the outer portion (310). In this regard, the terminal portion (320) of the cap (300) may include an exposed portion (322) and a support portion (321).

[0058] The exposed portion (322) of the terminal portion (320) may be provided to be exposed to the outside of the outer portion (310). Accordingly, the terminal portion (320) electrically connected to the electrode assembly (100) may be in electrical contact with the outside through the exposed portion (322) provided to be exposed to the outside of the outer portion (310). That is, the secondary battery (10) may provide electrical energy to the outside through the exposed portion (322).

[0059] Referring to FIG. 3, the exposed portion (322) of the terminal portion (320) may include an outer member (3221) and a passage member (3222).

[0060] The outer member (3221) of the exposed portion (322) may be arranged on the outer side of the outer portion (310). That is, one surface of the exposed portion (322) may be arranged to protrude from one surface of the outer portion (310) in a direction away from the electrode assembly (100) (upward direction in FIG. 3). With reference to FIG. 3, one surface of the exposed portion (322) may be the upper surface of the exposed portion (322), and one surface of the outer portion (310) may be the upper surface of the outer portion (310).

[0061] With respect to a more specific shape of the outer member (3221), a through hole may be formed in the outer member (310) for connecting the exposed portion (322) and the support portion (321), and the outer member (3221) may be formed in a shape that overlaps the through hole of the outer member (310). The overlap may mean that the entire outer member (3221) is positioned within the through hole (H) when projected from the outside of the outer member (310) toward the inside of the outer member (310) (downward direction in FIG. 3). This shape may allow the outer member (3221) to be inserted into the through hole (H) from the inside of the outer member (310) toward the outside of the outer member (310) (upward direction in FIG. 3).

[0062] The passage member (3222) of the exposed portion (322) can extend from the edge of the outer member (3221) in the inward direction (downward direction in FIG. 3) of the outer portion (310) and pass through the through hole. Preferably, the passage member (3222) can be formed along the edge of the outer member (3221).

[0063] The support portion (321) of the terminal portion (320) is connected to the exposed portion (322), and can be supported by the outer portion (310) on the inside of the outer portion (310) to prevent the exposed portion (322) from being separated from the outer portion (310). Since the support portion (321) is supported by the outer portion (310), the structural stability of the cap (300) can be improved.

[0064] With respect to the shape of the support member (321) supported by the outer member (310), the support member (321) may include a first member (3211) and a second member (3212).

[0065] The first member (3211) of the support member (321) may extend from the passage member (3222) in a direction (left-right direction in FIG. 3) orthogonal to the extension direction (up-down direction in FIG. 3) of the passage member (3222). At this time, the first member (3211) may be arranged to be caught on the inner surface of the outer portion (310). With reference to FIG. 3, the inner surface of the outer portion (310) may mean the lower surface of the outer portion (310).

[0066] The second member (3212) of the support member (321) extends from the first member (3211) toward the electrode assembly (100), and one end thereof can be electrically connected to the electrode assembly (100). At this time, a plurality of second members (3212) may be formed. That is, the support member (321) can be electrically connected to the electrode assembly (100) at a plurality of locations. Accordingly, when the secondary battery (10) includes a plurality of electrode assemblies (100), the plurality of electrode assemblies (100) can be electrically connected to the second member (3212) arranged at a close location, respectively. Through this, the secondary battery (10) can efficiently increase the battery capacity.

[0067] As illustrated in FIG. 2, the second member (3212) of the support member (321) may be formed along the edge of the first member (3211). This is merely an example, and the second member (3212) of the support member (321) may be connected only to the opposite corners of the first member (3211) having a substantially rectangular cross-section. That is, the second member (3212) may be connected only to the upper and lower portions of the first member (3211) based on FIG. 2. In this case, the second member (3212) extending from the upper and lower portions of the first member (3211) may be connected to two electrode tabs (110) arranged vertically, respectively.

[0068] Meanwhile, the second member (3212) may be combined with the outer film (200). Specifically, the second member (3212) may include a metal material, and the outer film (200) may include a resin layer having heat-sensitive adhesiveness at a portion facing the second member (3212). Accordingly, the second member (3212) and the outer film (200) may be combined by sealing using heat and pressure.

[0069] The cap (300) of the secondary battery (10) according to the first embodiment of the present invention can cover the electrode assembly (100) with the outer portion (310) and the terminal portion (320). Depending on the material of the outer portion (310), moisture or the like on the outside of the outer portion (310) can penetrate into the inner portion of the outer portion (310) by penetrating the outer portion (310). The penetration of moisture can cause a defect in the secondary battery (10). The cap (300) of the secondary battery (10) according to the first embodiment of the present invention can reduce the area of ​​the outer portion (310) through which moisture can penetrate by covering the electrode assembly (100) together with the terminal portion (320) made of metal. In addition, since the support part (321) is arranged in a form supported by the outer part (310), the moisture penetration path formed between the support part (321) and the outer part (310) can be lengthened. Accordingly, the secondary battery (10) according to the first embodiment of the present invention can reduce the phenomenon of problems occurring in the performance of the secondary battery (10) by reducing the amount of moisture penetrating into the interior.

[0070] As an example of a configuration for reducing moisture penetration, etc., in the secondary battery (10) according to Embodiment 1 of the present invention, the terminal portion (320) of the cap (300) may include a material having relatively low moisture permeability. Specifically, the terminal portion (320) of the cap (300) may be formed of a material having lower moisture permeability than the material forming the outer portion (310). Therefore, since the outer portion (310) and the terminal portion (320) together cover the electrode assembly (100), the amount of moisture permeating into the space where the electrode assembly (100) is accommodated can be reduced compared to when the electrode assembly (100) is covered only with the outer portion (310).

[0071] Example 2

[0072] FIG. 4 is an exploded perspective view schematically illustrating a secondary battery (10') according to Embodiment 2 of the present invention, and FIG. 5 is a cross-sectional view schematically illustrating a cap (300) and a portion of an outer film (200) of a secondary battery (10') according to Embodiment 2 of the present invention.

[0073] Hereinafter, a detailed description of the same configuration as that of the secondary battery (10) according to Embodiment 1 of the present invention will be omitted, and the differences will be specifically described. The secondary battery (10') according to Embodiment 2 of the present invention may differ from the secondary battery (10) according to Embodiment 1 in the shape of the external part (310'), the arrangement of the terminal part (320), the method of combining the configuration, etc.

[0074] Referring to FIG. 4, a secondary battery (10') according to Embodiment 2 of the present invention may include an electrode assembly (100), an outer film (200), and a cap (300). The outer film (200) of the secondary battery (10') may be provided to wrap a portion of the electrode assembly (100). Specifically, the outer film (200) may be provided to wrap the cap (300) and the electrode assembly (100). More specifically, the outer film (200) may be combined with the cap (300) to form an internal space, and the electrode assembly (100) may be accommodated in the internal space.

[0075] As an example of a configuration for improving bonding strength with the terminal portion (320), the outer portion (310') of the cap (300) according to Embodiment 2 of the present invention may include a first cover portion (311) and a second cover portion (312).

[0076] Referring to FIG. 5, the first cover portion (311) may be provided to cover the first member (3211) from the outside of the outer portion (310'). In addition, the second cover portion (312) may extend from the first cover portion (311) in a direction toward the electrode assembly (100). Specifically, the second cover portion (312) may be positioned between the second member (3212) and the outer film (200). More specifically, the second cover portion (312) may be formed along the edge of the first cover portion (311).

[0077] The second cover part (312) is disposed between the second member (3212) and the outer film (200), so that one side can be combined with the second member (3212) of the support part (321), and the other side can be combined with the outer film (200). At this time, an adhesive (400) can be applied to bond the second cover part (312) with the other component. That is, the adhesive (400) can be applied to one side and the other side of the second cover part (312). The second cover part (312) can be combined with the second member (3212) and the outer film (200) through the adhesive (400). Preferably, an adhesive (400) is applied between the outer film (200) and the outer portion (310') so that the outer film (200) and the outer portion (310') can be joined to each other, and an adhesive (400) is applied between the outer portion (310') and the terminal portion (320) so that the outer portion (310') and the terminal portion (320) can be joined to each other. Here, the type and application form of the adhesive (400) for joining can be varied.

[0078] Meanwhile, the cap (300) according to embodiment 2 of the present invention may be arranged such that one side of the terminal portion (320) is on the same plane as one side of the outer portion (310'). In this case, since there is no part of the terminal portion (320) that protrudes outward from the outer portion (310'), arrangement may be easy when arranging a plurality of secondary batteries (10').

[0079] The secondary battery according to the embodiment of the present invention described above can effectively prevent performance degradation due to volume changes in the electrode assembly. More specifically, the electrode assembly may experience volume changes (expansion or contraction) during the charge / discharge process.

[0080] However, since the secondary battery according to the present embodiment has an electrode assembly surrounded by an outer film having a predetermined degree of flexibility and stretchability, the outer film can be stretched or bent in response to changes in the volume of the electrode assembly. Consequently, the electrode assembly is not subject to additional deformation due to excessive friction or force, and thus, performance degradation of the secondary battery due to such deformation can be effectively prevented in the embodiments according to the present invention.

[0081] In contrast, in secondary batteries (e.g., square secondary batteries) in which the electrode assembly is housed in a cylindrical metal or plastic housing with a predetermined rigidity, the internal volume of the housing is fixed. Therefore, if the volume of the electrode assembly changes during the charging and discharging process, stress or friction may occur between the inner wall of the housing and the electrode assembly. This may cause deformation (e.g., twisting) of the electrode assembly, resulting in a deterioration in the performance of the secondary battery.

[0082] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and various embodiments are possible within the scope of the technical idea of ​​the present invention and the equivalent scope of the claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

[0083] [Explanation of symbols]

[0084] 10, 10': Secondary battery

[0085] 100: Electrode assembly

[0086] 110: Electrode tab

[0087] 200: Exterior film

[0088] 300: Cap

[0089] 310, 310': Exterior

[0090] 311: First cover section

[0091] 312: Second cover section

[0092] 320: Terminal section

[0093] 321: Support

[0094] 322: Exposed area

[0095] 400: Adhesive

[0096] 3211: First Absence

[0097] 3212: Second Absence

[0098] 3221: Outer member

[0099] 3222: Absence of passage

Claims

1. Electrode assembly; An outer film covering a portion of the electrode assembly; and comprising a cap surrounding the remainder of the electrode assembly; The above cap is, An outer portion combined with the outer film; and It is exposed to the outside and inside of the outer part, and includes a terminal part that is electrically connected to the electrode assembly at a part exposed to the inside of the outer part, The above terminal part, A secondary battery, wherein movement away from the electrode assembly is restricted by the outer portion.

2. In claim 1, The above terminal part, An exposed portion exposed to the outside of the above outer portion; and A secondary battery, comprising a support member that is connected to the exposed portion and is supported by the outer portion on the inside of the outer portion to prevent the exposed portion from being separated from the outer portion.

3. In claim 2, The above exposed part is, An outer member formed in a shape overlapping by a through hole formed in the outer part for connecting the exposed part and the support part and placed on the outside of the outer part; and A secondary battery comprising a passage member formed along the edge of the outer member and extending inwardly from the edge of the outer member to pass through the through hole.

4. In claim 3, The above support part, A secondary battery comprising a first member extending from the pass member in a direction perpendicular to the extension direction of the pass member and arranged to be hung on the inner surface of the outer portion.

5. In claim 4, The above support part, A secondary battery further comprising a second member extending from the first member toward the electrode assembly and having one end electrically connected to the electrode assembly.

6. In claim 5, The second member comprises a metal material, A secondary battery, wherein the outer film includes a resin layer that is bonded to the second member by heat and pressure.

7. In claim 5, The above external part, A first cover part covering the first member from the outside of the outer part; and A secondary battery comprising a second cover portion disposed between the second member and the outer film, coupled to the outer film, and extending from the first cover portion toward the electrode assembly.

8. In claim 7, The above support comprises a metal material, The above first cover part includes a resin material that has adhesiveness by heat, A secondary battery, wherein the support portion and the first cover portion are joined to each other by heat and pressure.

9. In claim 1, The above terminal part, A secondary battery, wherein one side is arranged to protrude away from the electrode assembly from one side of the outer portion.

10. In claim 1, The above cap is, A secondary battery in which one side of the outer portion and one side of the terminal portion are arranged on the same surface.

11. In claim 1, The above outer part includes a metal material, A secondary battery, wherein the outer film includes a metal layer that is welded to the outer part.

12. In claim 1, The above outer part includes a resin material that has adhesiveness by heat, A secondary battery, wherein the outer film includes a resin layer that is bonded to the outer portion by heat and pressure.

13. In claim 1, A secondary battery in which the outer film and the outer part are bonded to each other by an adhesive applied between the outer film and the outer part.

14. In claim 1, A secondary battery in which the outer shell and the terminal portion are joined to each other by an adhesive applied between the outer shell and the terminal portion.

15. Electrode assembly; An outer film having an inner space for accommodating the electrode assembly and an outer material opening for communicating the inner space with the outside; and Including a cap covering the outer material opening of the outer film, The above cap is, An outer portion combined with the outer film; and It is exposed to the outside and inside of the outer part, and includes a terminal part that is electrically connected to the electrode assembly at a part exposed to the inside of the outer part, The above terminal part, A secondary battery, which is arranged to block at least a portion of the opening of the outer shell and is composed of a material having lower moisture permeability than the material constituting the outer shell.

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